參數(shù)資料
型號: RTL8208
廠商: Electronic Theatre Controls, Inc.
英文描述: REALTEK SINGLE CHIP OCTAL 10/100 MBPS FAST ETHERNET TRANSCEIVER
中文描述: 瑞昱單芯片八路10/100 Mbps快速以太網(wǎng)收發(fā)器
文件頁數(shù): 7/40頁
文件大小: 546K
代理商: RTL8208
RTL8208
2001/01/07
7
Rev.1.923
5.3 Miscellaneous Pins
Pin Name
RESET#
Pin
Type
I,
(Pu)
I
Description
Reset:
This is an active low input. To complete the reset function, this
pin must be asserted low for at least 10ms.
25MHz Crystal X1 or 25MHz Oscillator clock input:
When X1 is
pulled low, X2 must be floating. REFCLK will then be the chip clock
input.
25MHz Crystal X2
Reference clock:
If X1 is 25MHz active, REFCLK is a 50MHz output.
If X1 is pulled-low (disabled), REFCLK is the clock input as below:
50MHz 100ppm clock input for RMII mode.
125MHz 100ppm clock input for SMII/SS-SMII mode.
Reference Bias Resistor:
This pin must be tied to analog ground through
an external 1.96K
resistor when using a 1:1 transformer on Tx/Rx.
Voltage control:
This pin controls a PNP transistor to generate the
2.5V power supply for VDD and VDDAL pins.
47
X1
114
X2
REFCLK
115
48
O
I/O
IBREF
118
A
VCTRL
116
O
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